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exec.go
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exec.go
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package helmexec
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"sync"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type decryptedSecret struct {
mutex sync.RWMutex
bytes []byte
}
type execer struct {
helmBinary string
version Version
runner Runner
logger *zap.SugaredLogger
kubeContext string
extra []string
decryptedSecretMutex sync.Mutex
decryptedSecrets map[string]*decryptedSecret
}
func NewLogger(writer io.Writer, logLevel string) *zap.SugaredLogger {
var cfg zapcore.EncoderConfig
cfg.MessageKey = "message"
out := zapcore.AddSync(writer)
var level zapcore.Level
err := level.Set(logLevel)
if err != nil {
panic(err)
}
core := zapcore.NewCore(
zapcore.NewConsoleEncoder(cfg),
out,
level,
)
return zap.New(core).Sugar()
}
// versionRegex matches versions like v1.1.1 and v1.1
var versionRegex = regexp.MustCompile("v(?P<major>\\d+)\\.(?P<minor>\\d+)(?:\\.(?P<patch>\\d+))?")
func parseHelmVersion(versionStr string) (Version, error) {
if len(versionStr) == 0 {
return Version{}, nil
}
matches := versionRegex.FindStringSubmatch(versionStr)
if len(matches) == 0 {
return Version{}, fmt.Errorf("error parsing helm verion '%s'", versionStr)
}
result := make(map[string]string)
for i, name := range versionRegex.SubexpNames() {
result[name] = matches[i]
}
// We ignore errors because regex matches only integers
// If any of the parts does not exist - default "0" will be used
major, _ := strconv.Atoi(result["major"])
minor, _ := strconv.Atoi(result["minor"])
patch, _ := strconv.Atoi(result["patch"])
// Support explicit helm3 opt-in via environment variable
if os.Getenv("HELMFILE_HELM3") != "" && major < 3 {
return Version{
Major: 3,
Minor: 0,
Patch: 0,
}, nil
}
return Version{
Major: major,
Minor: minor,
Patch: patch,
}, nil
}
func getHelmVersion(helmBinary string, runner Runner) (Version, error) {
// Autodetect from `helm verison`
bytes, err := runner.Execute(helmBinary, []string{"version", "--client", "--short"}, nil)
if err != nil {
return Version{}, fmt.Errorf("error determining helm version: %w", err)
}
return parseHelmVersion(string(bytes))
}
// New for running helm commands
func New(helmBinary string, logger *zap.SugaredLogger, kubeContext string, runner Runner) *execer {
// TODO: proper error handling
version, err := getHelmVersion(helmBinary, runner)
if err != nil {
panic(err)
}
return &execer{
helmBinary: helmBinary,
version: version,
logger: logger,
kubeContext: kubeContext,
runner: runner,
decryptedSecrets: make(map[string]*decryptedSecret),
}
}
func (helm *execer) SetExtraArgs(args ...string) {
helm.extra = args
}
func (helm *execer) SetHelmBinary(bin string) {
helm.helmBinary = bin
}
func (helm *execer) AddRepo(name, repository, cafile, certfile, keyfile, username, password string) error {
var args []string
if name == "" && repository != "" {
helm.logger.Infof("empty field name\n")
return fmt.Errorf("empty field name")
}
args = append(args, "repo", "add", name, repository)
if helm.IsHelm3() && helm.IsVersionAtLeast(3, 3, 2) {
args = append(args, "--force-update")
}
if certfile != "" && keyfile != "" {
args = append(args, "--cert-file", certfile, "--key-file", keyfile)
}
if cafile != "" {
args = append(args, "--ca-file", cafile)
}
if username != "" && password != "" {
args = append(args, "--username", username, "--password", password)
}
helm.logger.Infof("Adding repo %v %v", name, repository)
out, err := helm.exec(args, map[string]string{})
helm.info(out)
return err
}
func (helm *execer) UpdateRepo() error {
helm.logger.Info("Updating repo")
out, err := helm.exec([]string{"repo", "update"}, map[string]string{})
helm.info(out)
return err
}
func (helm *execer) BuildDeps(name, chart string) error {
helm.logger.Infof("Building dependency release=%v, chart=%v", name, chart)
out, err := helm.exec([]string{"dependency", "build", chart}, map[string]string{})
helm.info(out)
return err
}
func (helm *execer) UpdateDeps(chart string) error {
helm.logger.Infof("Updating dependency %v", chart)
out, err := helm.exec([]string{"dependency", "update", chart}, map[string]string{})
helm.info(out)
return err
}
func (helm *execer) SyncRelease(context HelmContext, name, chart string, flags ...string) error {
helm.logger.Infof("Upgrading release=%v, chart=%v", name, chart)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
if helm.IsHelm3() {
flags = append(flags, "--history-max", strconv.Itoa(context.HistoryMax))
} else {
env["HELM_TILLER_HISTORY_MAX"] = strconv.Itoa(context.HistoryMax)
}
out, err := helm.exec(append(append(preArgs, "upgrade", "--install", "--reset-values", name, chart), flags...), env)
helm.write(out)
return err
}
func (helm *execer) ReleaseStatus(context HelmContext, name string, flags ...string) error {
helm.logger.Infof("Getting status %v", name)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
out, err := helm.exec(append(append(preArgs, "status", name), flags...), env)
helm.write(out)
return err
}
func (helm *execer) List(context HelmContext, filter string, flags ...string) (string, error) {
helm.logger.Infof("Listing releases matching %v", filter)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
var args []string
if helm.IsHelm3() {
args = []string{"list", "--filter", filter}
} else {
args = []string{"list", filter}
}
out, err := helm.exec(append(append(preArgs, args...), flags...), env)
// In v2 we have been expecting `helm list FILTER` prints nothing.
// In v3 helm still prints the header like `NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION`,
// which confuses helmfile's existing logic that treats any non-empty output from `helm list` is considered as the indication
// of the release to exist.
//
// This fixes it by removing the header from the v3 output, so that the output is formatted the same as that of v2.
if helm.IsHelm3() {
lines := strings.Split(string(out), "\n")
lines = lines[1:]
out = []byte(strings.Join(lines, "\n"))
}
helm.write(out)
return string(out), err
}
func (helm *execer) DecryptSecret(context HelmContext, name string, flags ...string) (string, error) {
absPath, err := filepath.Abs(name)
if err != nil {
return "", err
}
helm.logger.Debugf("Preparing to decrypt secret %v", absPath)
helm.decryptedSecretMutex.Lock()
secret, ok := helm.decryptedSecrets[absPath]
// Cache miss
if !ok {
secret = &decryptedSecret{}
helm.decryptedSecrets[absPath] = secret
secret.mutex.Lock()
defer secret.mutex.Unlock()
helm.decryptedSecretMutex.Unlock()
helm.logger.Infof("Decrypting secret %v", absPath)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
out, err := helm.exec(append(append(preArgs, "secrets", "dec", absPath), flags...), env)
helm.info(out)
if err != nil {
return "", err
}
// HELM_SECRETS_DEC_SUFFIX is used by the helm-secrets plugin to define the output file
decSuffix := os.Getenv("HELM_SECRETS_DEC_SUFFIX")
if len(decSuffix) == 0 {
decSuffix = ".yaml.dec"
}
decFilename := strings.Replace(absPath, ".yaml", decSuffix, 1)
secretBytes, err := ioutil.ReadFile(decFilename)
if err != nil {
return "", err
}
secret.bytes = secretBytes
if err := os.Remove(decFilename); err != nil {
return "", err
}
} else {
// Cache hit
helm.logger.Debugf("Found secret in cache %v", absPath)
secret.mutex.RLock()
helm.decryptedSecretMutex.Unlock()
defer secret.mutex.RUnlock()
}
tmpFile, err := ioutil.TempFile("", "secret")
if err != nil {
return "", err
}
_, err = tmpFile.Write(secret.bytes)
if err != nil {
return "", err
}
return tmpFile.Name(), err
}
func (helm *execer) TemplateRelease(name string, chart string, flags ...string) error {
helm.logger.Infof("Templating release=%v, chart=%v", name, chart)
var args []string
if helm.IsHelm3() {
args = []string{"template", name, chart}
} else {
args = []string{"template", chart, "--name", name}
}
out, err := helm.exec(append(args, flags...), map[string]string{})
helm.write(out)
return err
}
func (helm *execer) DiffRelease(context HelmContext, name, chart string, suppressDiff bool, flags ...string) error {
helm.logger.Infof("Comparing release=%v, chart=%v", name, chart)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
out, err := helm.exec(append(append(preArgs, "diff", "upgrade", "--reset-values", "--allow-unreleased", name, chart), flags...), env)
// Do our best to write STDOUT only when diff existed
// Unfortunately, this works only when you run helmfile with `--detailed-exitcode`
detailedExitcodeEnabled := false
for _, f := range flags {
if strings.Contains(f, "detailed-exitcode") {
detailedExitcodeEnabled = true
break
}
}
if detailedExitcodeEnabled {
switch e := err.(type) {
case ExitError:
if e.ExitStatus() == 2 {
if !(suppressDiff) {
helm.write(out)
}
return err
}
}
} else if !(suppressDiff) {
helm.write(out)
}
return err
}
func (helm *execer) Lint(name, chart string, flags ...string) error {
helm.logger.Infof("Linting release=%v, chart=%v", name, chart)
out, err := helm.exec(append([]string{"lint", chart}, flags...), map[string]string{})
helm.write(out)
return err
}
func (helm *execer) Fetch(chart string, flags ...string) error {
helm.logger.Infof("Fetching %v", chart)
out, err := helm.exec(append([]string{"fetch", chart}, flags...), map[string]string{})
helm.info(out)
return err
}
func (helm *execer) DeleteRelease(context HelmContext, name string, flags ...string) error {
helm.logger.Infof("Deleting %v", name)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
out, err := helm.exec(append(append(preArgs, "delete", name), flags...), env)
helm.write(out)
return err
}
func (helm *execer) TestRelease(context HelmContext, name string, flags ...string) error {
helm.logger.Infof("Testing %v", name)
preArgs := context.GetTillerlessArgs(helm)
env := context.getTillerlessEnv()
args := []string{"test", name}
out, err := helm.exec(append(append(preArgs, args...), flags...), env)
helm.write(out)
return err
}
func (helm *execer) exec(args []string, env map[string]string) ([]byte, error) {
cmdargs := args
if len(helm.extra) > 0 {
cmdargs = append(cmdargs, helm.extra...)
}
if helm.kubeContext != "" {
cmdargs = append([]string{"--kube-context", helm.kubeContext}, cmdargs...)
}
cmd := fmt.Sprintf("exec: %s %s", helm.helmBinary, strings.Join(cmdargs, " "))
helm.logger.Debug(cmd)
bytes, err := helm.runner.Execute(helm.helmBinary, cmdargs, env)
helm.logger.Debugf("%s: %s", cmd, bytes)
return bytes, err
}
func (helm *execer) info(out []byte) {
if len(out) > 0 {
helm.logger.Infof("%s", out)
}
}
func (helm *execer) write(out []byte) {
if len(out) > 0 {
fmt.Printf("%s\n", out)
}
}
func (helm *execer) IsHelm3() bool {
return helm.version.Major == 3
}
func (helm *execer) GetVersion() Version {
return helm.version
}
func (helm *execer) IsVersionAtLeast(major int, minor int, patch int) bool {
return helm.version.Major >= major && helm.version.Minor >= minor && helm.version.Patch >= patch
}